A test block for verifying thickness measurement capability

Abstract

The present invention relates to the field of ultrasonic thickness measurement, and specifically to a thickness measurement capability verification test block. It includes a circular tube thickness measuring unit, a closed structure and a cylindrical thickness measuring unit. The circular tube thickness measuring unit includes a circular tube, and the circular tube is provided with a plurality of annular sections with different wall thicknesses along the axial direction, and the wall thickness of the annular sections cannot be directly measured from the outside of the circular tube; the closed structure includes an upper end cover and a lower end cover capable of blocking both ends of the circular tube, and the upper end cover is provided with at least one through hole; the cylindrical thickness measuring unit is arranged inside the circular tube, and includes at least one cylinder equal to the number of through holes, and the upper end of the cylinder is inserted into the through hole, and the lower end is connected to the lower end cover. The present invention provides a verification test block that can effectively test and verify the thickness measurement capability of instruments and personnel.

Description

Technical Field

[0001] The invention relates to the field of ultrasonic thickness measurement, and in particular to a thickness measurement capability verification test block. Background Art

[0002] Ultrasonic thickness measurement is the use of ultrasonic thickness gauges to measure the thickness of workpieces of known or unknown thickness. This technology has been widely used in non-destructive testing technology.

[0003] In the process of ultrasonic thickness measurement, the thickness gauge, personnel and technical level have a direct impact on the thickness measurement results. In the existing technology, in order to test and verify the thickness measurement capabilities of the instrument and personnel, two methods are generally used: one is to gather the operators and use the thickness measurement verification block for on-site verification, and the entire verification process is supervised by all supervisors; the other is to mail the thickness measurement verification block to each operator or organization, and the operator will measure it by himself and feedback the results to the verification and assessment organization.

[0004] The above two methods have the following problems: 1. The shape and structure of the thickness verification test block are visible to the operator, and some basic information is passed to the operator in disguise. At the same time, the centralized assessment and verification requires a large number of personnel, and the workload is large; 2. The mailing method lacks personnel supervision, and the operator may obtain accurate result information through other measurement tools, which affects the fairness of the verification results; 3. In order to avoid the leakage of basic information, the thickness verification test block is pasted or fixed to other objects. When there is an objection to the measurement result, the verification test block cannot be disassembled for result verification; 4. In order to obtain multiple results and ensure the observability and fairness of the results, multiple thickness verification test blocks are required, such as test blocks with curved surfaces and test blocks with flat surfaces, resulting in a large number of test block specifications and inconvenience in use. Therefore, a new thickness verification test block is needed to solve the above problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a verification test block which can effectively test and verify the thickness measurement capability of instruments and personnel in view of the above-mentioned deficiencies in the prior art.

[0006] A thickness measurement capability verification test block, characterized in that it comprises a round tube thickness measurement unit, a closed structure and a cylindrical thickness measurement unit,

[0007] The circular tube thickness measuring unit comprises a circular tube, wherein the circular tube is provided with a plurality of annular sections with different wall thicknesses along the axial direction, and the wall thickness of the annular sections cannot be directly measured from the outer side of the circular tube;

[0008] The closed structure comprises an upper end cover and a lower end cover capable of sealing both ends of the circular tube, and the upper end cover is provided with at least one through hole;

[0009] The cylindrical thickness measuring unit is arranged inside the circular tube, and comprises at least one cylinder whose number is equal to the through holes, wherein the upper end of the cylinder is inserted into the through hole, and the lower end is connected to the lower end cover.

[0010] Preferably, the circular tube is provided with a plurality of annular sections with successively increasing or decreasing wall thicknesses along the axial direction, and the outer wall of the circular tube is a smooth surface.

[0011] Preferably, the upper end cover and the lower end cover are connected via an anti-disassembly structure.

[0012] Preferably, the anti-disassembly structure comprises a special-shaped head screw, the inner end of the upper end cover is provided with a blind hole, the lower end cover is provided with a through hole, one end of the special-shaped head screw is passed through the through hole, and the other end is screwed into the blind hole.

[0013] Preferably, a limiting structure is provided in the through hole of the upper end cover to prevent the cylinder from slipping out upwards.

[0014] Preferably, the limiting structure is an inner chamfer, and the upper end of the cylinder is provided with an outer chamfer matching the inner chamfer.

[0015] Preferably, when the number of cylinders is more than one, the lengths of the cylinders are different.

[0016] Preferably, the lower end of the cylinder is connected to the lower end cover through a lifting mechanism, and the lifting mechanism includes a lifting sleeve, a bracket and an adjusting screw. The lifting sleeve includes a rectangular outer cylinder and a rectangular column slidably inserted into the rectangular outer cylinder. The bracket is arranged at the upper end of the rectangular column. One end of the adjusting screw is rotatably connected to the lower end cover through a bearing, and the other end is screwed to the lower end of the rectangular column. The lower end of the rectangular outer cylinder is fixedly connected to the lower end cover.

[0017] Preferably, the height of the cylinder is less than half the height of the barrel.

[0018] Preferably, the upper end cover is provided with 6 through holes in a circular array, and there are 6 corresponding cylinders, and the height of the cylinders ranges from 5 mm to 100 mm.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention cleverly combines a plurality of cylindrical thickness measuring units and a circular tube thickness measuring unit with an annular concave-convex structure into one, thereby reducing the number of test blocks and making it more convenient to use;

[0021] 2. By setting the cylindrical thickness measuring unit inside the round tube and setting a closed structure, the appearance information of the internal thickness measuring block can be prevented from being directly exposed to the operator, thereby ensuring the fairness of the measurement results; further, by setting an anti-disassembly structure, the device can be prevented from being disassembled at will, thereby ensuring the leakage of the test block information in the absence of personnel supervision and ensuring the validity of the test results.

[0022] 3. The various parts of the device can be disassembled, which is convenient for the examiner to calibrate the measurement structure after disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention from a top view angle;

[0025] Figure 3 It is a schematic structural diagram of the end of the special-shaped head screw rod away from the blind hole of the present invention;

[0026] In the figure: 1. round tube, 10. annular section, 2. cylinder, 20. outer chamfer, 3. upper end cover, 30. inner chamfer, 4. lower end cover, 5. special-shaped head screw, 50. special-shaped groove, 6. lifting mechanism, 60. rectangular outer tube, 61. rectangular column, 62. bracket, 63. adjusting screw, 64. bearing, 7. cover. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] like Figure 1 and Figure 2 As shown, a thickness measurement capability verification test block of this embodiment includes a circular tube thickness measurement unit, a closed structure and a cylindrical thickness measurement unit.

[0029] The circular tube thickness measuring unit includes a circular tube 1, which is provided with a plurality of annular sections with different wall thicknesses along the axial direction, and the wall thickness of the annular section 10 cannot be directly measured from the outside of the circular tube 1; the closed structure includes a circular upper end cover 3 and a lower end cover 4 that can seal the two ends of the circular tube 1.

[0030] In this embodiment, an annular installation step is provided at each of the upper and lower ends of the inner wall of the circular tube 1, and the upper end cover 3 and the lower end cover 4 are embedded in the installation step. After installation, the upper and lower end covers 4 are hidden inside the thickness measuring block of the circular tube 1; a plurality of annular sections 10 with increasing or decreasing wall thicknesses are provided axially between the two annular installation steps of the circular tube 1, and the outer wall of the circular tube 1 is a smooth surface. The axial lengths of the plurality of annular sections 10 are equal. The wall thickness range of the annular section 10 is 0.5~10mm, and the specifications can be selected according to actual needs. The standard thickness connection of different diameters adopts a transition fillet, and the thickness and boundary marks are made at the corresponding position of the outer wall of the circular tube 1 for easy distinction and use. It can be understood that the annular section 10 can include annular grooves and bosses arranged on the inner wall or outer wall of the circular tube 1, as long as different wall thicknesses can be formed and the wall thickness cannot be directly measured from the outside of the circular tube 1.

[0031] At least one through hole is provided on the upper end cover 3; in this embodiment, six through holes are provided on the upper end cover 3 in a circumferential array, and a limiting structure is provided in the through hole to prevent the cylinder 2 from slipping out upwards. Optionally, the limiting structure is a 45° inner chamfer 30 provided at the upper end of the through hole. In this embodiment, the diameter of the through hole is φ20.5 mm.

[0032] The upper end cover 3 and the lower end cover 4 are connected by an anti-disassembly structure. Specifically, the anti-disassembly structure includes a special-shaped head screw 5, a blind hole is provided at the inner end of the upper end cover 3, and a through hole is provided on the lower end cover 4. One end of the special-shaped head screw 5 is inserted into the through hole, and the other end is screwed into the blind hole. The special-shaped head screw 5 passes through the through hole and is connected to the upper end cover 3, and the upper and lower end covers 4 are fastened by the special-shaped head screw 5.

[0033] like Figure 3 As shown, the head of the special-shaped head screw 5 can be a countersunk head or a semicircular head, and a special-shaped groove 50 is arranged on the top of the head. The special-shaped groove 50 is in the shape of petals, the number of petals is odd, the center is circular, and it is used in conjunction with a special-shaped wrench for adjustment. The special-shaped wrench is an L-shaped wrench, and the end is a raised petal shape. The end protrusion cooperates with the special-shaped groove 50 on the head of the special-shaped head screw 5. The special-shaped head screw 5 and the matching special-shaped wrench can prevent disassembly by commonly used flat and cross wrenches. This design makes it very difficult to disassemble the verification test block at will.

[0034] The cylindrical thickness measuring unit is arranged inside the circular tube 1, and includes at least one cylinder 2 equal to the number of through holes. When the number of cylinders 2 is more than one, the lengths of the cylinders 2 are different. The actual size of the cylinder 2 can be marked on the outer circle of the cylinder 2 for easy verification. In this embodiment, there are 6 cylinders 2, and the surface of the upper end cover 3 is marked with numbers 1-6. Cylinders 2 of different lengths can be interchangeably adjusted in the numbers 1-6 to form a combination of multiple specifications.

[0035] In this embodiment, the axis of the cylinder 2 is parallel to the axis of the circular tube 1, the upper end of the cylinder 2 is inserted into the through hole of the upper end cover 3, and the lower end is connected to the lower end cover 4. The upper end of the cylinder 2 is provided with a 45° outer chamfer 20 matching the inner chamfer 30 of the through hole, and the cylinder 2 can be automatically centered when inserted into the through hole. In this embodiment, the outer diameter of the cylinder 2 is φ20mm±0.1. Preferably, the height range of the cylinder 2 is 5mm~100mm and the height of the cylinder 2 is less than half of the height of the circular tube.

[0036] Furthermore, the lower end of the cylinder 2 is connected to the lower end cover 4 through a lifting mechanism 6, and the lifting mechanism 6 includes a lifting sleeve, a bracket 62 and an adjusting screw 63. The lifting sleeve includes a rectangular outer cylinder 60 and a rectangular column 61 that is slidably inserted into the rectangular outer cylinder 60. The bracket 62 is arranged at the upper end of the rectangular column 61. One end of the adjusting screw 63 is rotatably connected to the lower end cover 4 through a bearing 64, and the other end is screwed to the lower end of the rectangular column 61. The lower end of the rectangular outer cylinder 60 is fixedly connected to the lower end cover 4. The bracket 62 is a circular structure with a circular groove in the center, and the lower end of the cylinder 2 is inserted into the circular groove. The lifting mechanism 6 can realize the falling and pressing of the cylinder 2.

[0037] Furthermore, the closed structure also includes a sealing cover 7 arranged below the lower end cover 4, and the circular tube 1, the upper end cover 3 and the sealing cover 7 are enclosed to form a cylindrical closed body.

[0038] The present invention skillfully combines a plurality of cylindrical thickness measuring units and circular tube thickness measuring units with annular sections of different wall thicknesses into one, thereby reducing the number of test blocks and making it more convenient for operators to use; by arranging the cylindrical thickness measuring unit inside the circular tube 1 and providing a closed structure, it is possible to prevent the external shape information of the internal thickness measuring block from being directly exposed to the operator, thereby ensuring the fairness of the measurement result; further, by providing an anti-disassembly structure, the device can be prevented from being disassembled at will, thereby ensuring the leakage of test block information in the absence of personnel supervision and ensuring the validity of the detection result.

[0039] The operator can use an ultrasonic thickness gauge to measure the wall thickness of the round tube 1 at various locations from the side wall of the round tube 1, and measure the height of the cylinder 2 from the top of the cylinder 2. The examiner can use a special-shaped wrench to remove the special-shaped head screw 5, thereby removing the upper end cover 3, and checking whether the height of each cylinder 2 is correct; since there are thickness and boundary marks on the round tube 1, and there is a data table for the thickness corresponding to the mark, the operator's test results can be checked against the data table.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thickness measurement capability verification test block, characterized in that: Including tube thickness measurement unit, closed structure and cylindrical thickness measurement unit, The circular tube thickness measuring unit comprises a circular tube (1), wherein the circular tube (1) is provided with a plurality of annular sections (10) with different wall thicknesses along the axial direction, and the wall thickness of the annular sections (10) cannot be directly measured from the outside of the circular tube (1); The closed structure comprises an upper end cover (3) and a lower end cover (4) capable of sealing the two ends of the circular tube (1), and the upper end cover (3) is provided with at least one through hole; The cylindrical thickness measuring unit is arranged inside the circular tube (1), and comprises at least one cylinder (2) whose number is equal to the number of through holes, the upper end of the cylinder (2) being inserted into the through hole and the lower end being connected to the lower end cover (4); The upper end cover (3) and the lower end cover (4) are connected via an anti-disassembly structure; The anti-disassembly structure comprises a special-shaped head screw (5), the inner end of the upper end cover (3) is provided with a blind hole, the lower end cover (4) is provided with a through hole, one end of the special-shaped head screw (5) is inserted into the through hole, and the other end is screwed into the blind hole.

2. A thickness measurement capability verification test block according to claim 1, characterized in that: The circular tube (1) is provided with a plurality of annular sections (10) with wall thicknesses increasing or decreasing sequentially along the axial direction, and the outer wall of the circular tube (1) is a smooth surface.

3. A thickness measurement capability verification test block according to claim 1, characterized in that: A limiting structure is provided in the through hole of the upper end cover (3) to prevent the cylinder (2) from falling out upwards.

4. A thickness measurement capability verification test block according to claim 3, characterized in that: The limiting structure is an inner chamfer (30), and the upper end of the cylinder (2) is provided with an outer chamfer (20) matching the inner chamfer (30).

5. A thickness measurement capability verification test block according to claim 1, characterized in that: When the number of the cylinders (2) is more than one, the lengths of the cylinders (2) are different.

6. A thickness measurement capability verification test block according to claim 1 or 5, characterized in that: The lower end of the cylinder (2) is connected to the lower end cover (4) via a lifting mechanism (6). The lifting mechanism (6) comprises a lifting sleeve, a bracket (62) and an adjusting screw (63). The lifting sleeve comprises a rectangular outer cylinder (60) and a rectangular column (61) slidably inserted into the rectangular outer cylinder (60). The bracket (62) is arranged at the upper end of the rectangular column (61). One end of the adjusting screw (63) is rotatably connected to the lower end cover (4) via a bearing (64), and the other end is screwed to the lower end of the rectangular column (61). The lower end of the rectangular outer cylinder (60) is fixedly connected to the lower end cover (4).

7. A thickness measurement capability verification test block according to claim 6, characterized in that: The height of the column (2) is less than half the height of the cylinder.

8. A thickness measurement capability verification test block according to claim 7, characterized in that: The upper end cover (3) is provided with six through holes in a circular array, and there are six corresponding cylinders (2), and the height of the cylinders (2) ranges from 5 mm to 100 mm.

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